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Evaluation of solvent extracted meals from winter rapeseed differing in the glucosinolate content with pigs in consideration of iodine supply 1. on the characterization of rapeseed meals and on fattening results



Evaluation of solvent extracted meals from winter rapeseed differing in the glucosinolate content with pigs in consideration of iodine supply 1. on the characterization of rapeseed meals and on fattening results



Archives of Animal Nutrition 40(9): 841-854



In a feeding experiment with 48 growing pigs 16% high glucosinolate rapeseed meal (HGRSM) (136 .mu.mol glucosinolates + aglucones/kg dry matter, DM) or low glucosinolate (LG) RSM (48 .mu.mol glucosinolates + aglucones/kg DM) in the feed were compared with 14% soya-bean meal (SBM) in each case. 24 pairs of animals, were established which received the same quantity of the isonitrogenous but not isocaloric diets with SBM and the both RSM (pair fed). Four of the 2 .cntdot. 12 animal pairs were not given supplementary I, four received 0.25 mg supplementary I/kg feed. Further four animals which were fed on LGRSM or HGRSM were provided with 0.0625 or 1 mg supplementary I/kg feed. In case of high glucosinolate intake (HGRSM) the lacking I supplementation decreased feed intake and growth and led to remarkable I deficiency symptoms from the fifth week onwards. The 2/3 lower glucosinolate dosage of the LGRSM diet also decreased performance and provoked I deficiency, however significantly later. The investigated I dosages (> 0.0625 mg/kg feed) did not effect the performance. In the experiment the eight animals which received LGRSM with supplementary I consumed 13% more feed than animals fed on HGRSM (P < 0.05). The additional weight gain was 20% (P < 0.05). Comparing the live weight gain of the SBM and RSM fed animals (pair fed) there was a significant increase of 9% versus the HGRSM groups and 5% versus the LGRSM groups.

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